ingot


Also found in: Dictionary, Thesaurus, Financial, Acronyms, Wikipedia.

ingot

a piece of cast metal obtained from a mould in a form suitable for storage, transporting, and further use

Ingot

 

a cast metal blank intended for further processing by some method of plastic deformation (rolling, forging, or extrusion), by remelting (molding or alloying), or by electrolysis (in which the anodes are of blister copper or nickel). Ingots are obtained by pouring molten metal into molds with comparatively simple shapes, by continuous casting, and by filling water-cooled crystallizers (electroslag remelting and remelting in arc vacuum furnaces).

Ingots cast in molds and intended for subsequent pressure shaping usually have the form of a truncated pyramid or truncated cone. If a metal crystallizes with a shrinkage, as is the case with killed steel, the ingot will contain a head, which usually contains a contraction cavity. During subsequent conversion, the head is cut off and routed for remelting. Rimmed steel solidifies without forming a contraction cavity, and the ingots thus do not have a head.

Ingots cast by continuous casting methods have the shape of a prism with a square, rectangular, or polygonal cross section or the shape of a cylinder. Ingots are sometimes cast in more complex shapes, for example, hollow shapes. A comparatively small contraction cavity is located in the upper part of continuously cast ingots. This part is separated when the blanks are cut to measured lengths. In ingots obtained by electroslag and arc vacuum remelting, the contraction cavity is much smaller. This is caused by the lowering of the filling speed during the final stage of ingot formation.

The weight of ingots destined for pressure shaping ranges from several kilograms to more than 250 tons. The most widely used ingots weigh 0.5 to 20 tons.

Pig iron ingots and ingots of certain nonferrous metals destined for remelting are usually in the shape of small, strongly tapered, truncated pyramids called pigs, whose weight, as a rule, does not exceed 30–40 kg. Other ingot shapes include bars (copper) and billets of various shapes.

Since the conditions for crystallization of a metal change substantially during solidification, the structure and chemical composition of ingots are nonhomogeneous. The larger the ingot, the more pronounced is the chemical and structural nonho-mogeneity. Ingots obtained by continuous casting or by filling a crystallizer are much more homogeneous than ingots cast in molds.

REFERENCES

Metallurgiia stali. Edited by V. I. Iavoiskii and G. N. Oiks. Moscow, 1973.
Kurdiumov, A. V., M. V. Pikunov, and V. M. Chursin. Liteinoe proizvodstvo tsvetnykh i redkikh metallov. Moscow, 1972.

A. IA. STOMAKHIN

ingot

[′iŋ·gət]
(metallurgy)
A solid metal casting suitable for remelting or working.
A bar of gold or silver.

ingot

A mass of molten metal which has been poured into a mold to solidify; it differs from a casting in that it requires rolling or forging to become a finished or semifinished product.

silicon ingot

A salami-shaped bar of silicon, which is a single crystal, technically known as a "boule." The ingot is the first step in chip making. High-speed saws slice the ingot into "wafers" about the thickness of a dime, which are then ground and polished mirror smooth. The surfaces of the wafer are etched to form all the transistors on all the chips at the same time. The final step is to cut apart the chips and place them into their packages. See wafer, chip package and transistor.


Drawing the Silicon Ingot
An ingot is being drawn from a furnace containing molten silicon. (Image courtesy of Texas Instruments, Inc.)







An Ingot Plant
At a Silicon Valley Microelectronics plant, the ingots are "grown" in these cylinders. SVM makes the ingots and slices them into wafers for their customers. (Image courtesy of Silicon Valley Microelectronics, Inc., www.svmi.com)







The Pulled Ingot
This is a finished ingot ready for slicing into wafers. (Image courtesy of Silicon Valley Microelectronics, Inc., www.svmi.com)
References in periodicals archive ?
It involved an ingot with the temperature of 600[degrees]C placed in a furnace at 1,150[degrees]C in a 1 m distance from the furnace lining (Tikal & Urbanek, 2010).
We have proposed a concept of a multi-profile furnace for producing blanks of especially large rolling in rolls of thick plate mills 5000 and 5500 whose weight reaches 240--250 t, and also of solid and hollow forging ingot weighing up to 300 t.
"We are pleased to have finalized this 2007 ingot supply contract with REC SiTech, who we view as an important strategic partner," said PM Pai, chief operating officer of SunPower.
Designing a new range of ingots has helped a Staffordshire firm supply metal alloys to new clients across Europe.
A factual attack might track the correlation, if any, between the index and lead ingot sales before the alleged price fixing.
To date, aluminum-lithium alloy ingots have been rolled in sizes from 8500 to 10,000 lb to develop rolling and finishing procedures.
About 340,000 tons of aluminium ingots were produced in Iran in the last fiscal year, ended March 2018, according to the data released by the Iranian Mines and Mining Industries Development and Renovation Organization (IMIDRO).
The volume of aluminum ingot production in the country over the Iranian calendar month of Mordad (July 23-August 22) hit 29,747 tons, registering a nine-percent growth compared to the corresponding period last year.
Solarfun Power Holdings Co Ltd (Nasdaq:SOLF), a vertically integrated manufacturer of silicon ingots, wafers and photovoltaic (PV) cells and modules in China, today announced that it has already reached its 2010 year-end target of 360 MW in ingot manufacturing capacity, 400 MW in wire saw capacity, 500 MW of cell capacity and 900 MW in module capacity.
Sow ingots are widely used in the automotive industry, but a canning company typically wants sheet ingot.
The aluminium complex will produce primary aluminium with a product mix of sow, standard ingot, tee ingot, extrusion billet and sheet ingot.
The dependence of the thermal state of the ingot in EBMIC on melting productivity was investigated.